public class test3 {
    public static void main(String[] args) {
        //判断一个数是奇数还是偶数
        int[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] % 2 == 1) {
                arr[i] = 2 * arr[i];
            } else if (arr[i] % 2 == 0) {
                arr[i]=arr[i]/2;
            }
            System.out.println(arr[i]);
        }
    }
}
